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Inorg Chem. 2019 Jul 15;58(14):9500-9504. doi: 10.1021/acs.inorgchem.9b01491. Epub 2019 Jun 26.

Study of Crystallization and Coalescence of Nanocrystals in Amorphous Glass at High Temperature.

Wang T1, Lu W1,2, Xu X1,3, Qiu J3, Yu SF1.

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Department of Applied Physics , The Hong Kong Polytechnic University , Hong Kong , China.
University Research Facility in Materials Characterization and Device Fabrication , The Hong Kong Polytechnic University , Hong Kong China.
College of Materials Science and Engineering , Kunming University of Science and Technology , Kunming 650093 , China.


Amorphous fluoride glass is used as the reaction chamber (i.e., solid cell) to grow Ba2LaF7 (BLF) nanocrystals at elevation temperatures (i.e., 300-500 °C) so that in situ real-time crystallization and coalescence of BLF nanocrystals can be observed. Due to the inherent advantages of the liquid-like solid medium, high temporal and spatial resolution transmission electron microscopy images can be obtained. Hence, we reveal that the twinned and quadruplet BLF nanocrystals are formed at low temperature (≤430 °C) and the unification of two nanocrystals via the two pathways (i.e., migration with and without rotation) to a single defect-free BLF nanocrystal is favored at high temperature (≥470 °C).

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